Don't worry! I'm sure you're reunion will be a success. If the number of attendees is small, someone in the family will forge a new relationship with another family member that they knew only a few things about before the reunion. That in itself, is a blessing.

It is always hard to keep track of people, as people die, addresses change, etc. For our reunions, we have a rule that whomever plans the next one gets the disc of addresses and the plaque. (We have a plaque that is passed down that the last reunion committee got inscribed with the reunion location and year on it) Perhaps you call start this so you have something to start with?

I plan on putting all the addresses I have into an Access database so that I, in addition to the reunion committee, has something to work with.